1. Material classification 

Steel bridge: galvanized steel, stainless steel (304/316), aluminium alloy and so on.

Galvanised bridge (corrosion resistance, commonly used).

Stainless steel bridge (corrosion-resistant, suitable for chemical and marine environments).

Aluminium alloy bridge (lightweight, corrosion resistance, no electromagnetic interference).

Fiberglass reinforced plastic bridge: corrosion-resistant, insulation, suitable for chemical industry, outdoor humid environment.

Plastic bridge: made of PVC or PE, corrosion-resistant, but lower load-bearing.

2. Structure type 

Trough type bridge: fully closed structure, dustproof, anti-interference, suitable for laying sensitive cables (such as communication, computer cables).

Tray type bridge: the bottom of the open hole, good heat dissipation, commonly used in power cable laying.

Ladder type bridge: cross-file structure, breathable, suitable for large diameter cables.

Grid-type bridge: open grid design, lightweight, good heat dissipation, suitable for data centres.

3. Common dimensions (width×height, unit: mm) 

Width: 50, 100, 150, 200, 300, 400, 500, 600, 800, 1000, etc.

Height: 50, 75, 100, 150, 200, etc.

Length: usually 2m or 6m/root (customised length is negotiable).

Example: 

100×50mm (width×height) 

300×100mm 

600×200mm 

4. Thickness standard (steel plate) 

Ordinary bridge: 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm (the greater the thickness, the stronger the load bearing).

Aluminium alloy/stainless steel: 1.2mm~3.0mm (choose according to load demand).

5. Protection level 

IP30: Normal indoor environment.

IP54: Dust-proof, splash-proof (humid environment).

IP65: Dustproof, waterproof spray (outdoor or industrial environment).

6. Load Rating 

Light: For scenarios with fewer cables and no heavy loads (e.g. communication cables).

Medium: common power cable laying.

Heavy duty: large diameter cables or dense laying (e.g. substations, industrial plants).

7. Other parameters 

Surface treatment: galvanised, sprayed (different colours), anodised (aluminium alloy).

Fire rating: ordinary type, flame retardant type (need to comply with GB/T 19215 standard).